Correcting my work

Starting chapter 6 tonight! Just went over the correction for my journal entry style piece and I made some really stupid mistakes! How did I manage to forget the ンin チキン!? Note to self: Always proof read things. I think I have learned a bit about when to use Kanji and Kanna. I always assumed if there was a Kanji for a word then I should use it but it seems that some Kanji are just not used, like in the case of the word おいしい. I'm still a little unsure about some of the corrections, but I have just discovered the Lang 8 website where native Japanese will translate and correct pieces for free so hopefully I can get some more clarification on some parts. Sorry everyone who had to read my Japanese, I know its really terrible but I have only been learning for a month and a half.